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What is Shuffling and Sorting in a MapReduce?
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What are ‘reduces’?
what are the most common input formats defined in Hadoop?
how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
What do sorting and shuffling do?
Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
What is Reduce only jobs?
How much space will the split occupy in Mapreduce?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
Name job control options specified by mapreduce.
What can be optimum value for Reducer?
What do you know about nlineinputformat?
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